The sexual act of laying underneath a man's anus, firmly grasping his erection, and pulling downwards as if preparing a soft-serve ice cream cone while he proceeds to defecate (poop) directly into the mouth of an ice cream-lover.
"You know Shelby? Yeah, I totally gave her a Dirty Ice Cream Machine last night. She really loves chocolate."
by ConroyGullam April 23, 2010
Get the Dirty Ice Cream Machinemug.